linux-kernel - Re: [PATCH v2 2/3] staging: rtl8192u: move debug files to debugfs

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Date:   Tue, 19 Jul 2022 14:37:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tong Zhang <ztong0001@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Colin Ian King <colin.king@...el.com>,
        Saurav Girepunje <saurav.girepunje@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev, dan.carpenter@...cle.com
Subject: Re: [PATCH v2 2/3] staging: rtl8192u: move debug files to debugfs

On Mon, Jul 18, 2022 at 10:50:37PM -0700, Tong Zhang wrote:
> There are 4 debug files created under /proc/net/[Devname]. Devname could
> Due to this is purely for debuging as files are created read only,
> move this to debugfs like other NIC drivers do instead of using procfs.
> This is also to prepare for address rmmod warn issue.

Minor comments based on good debugfs usage:

> --- a/drivers/staging/rtl8192u/r8192U.h
> +++ b/drivers/staging/rtl8192u/r8192U.h
> @@ -1061,6 +1061,9 @@ typedef struct r8192_priv {
>  	struct delayed_work gpio_change_rf_wq;
>  	struct delayed_work initialgain_operate_wq;
>  	struct workqueue_struct *priv_wq;
> +
> +	/* debugfs */
> +	struct dentry *debugfs_dir;

Why do you need to save this dentry?  Can't you just look it up when you
want to remove the files?

> +void rtl8192_debugfs_init(struct net_device *dev)
>  {
> -	struct proc_dir_entry *dir;
> +	struct dentry *dir;
> +	struct r8192_priv *priv = (struct r8192_priv *)ieee80211_priv(dev);

No need to cast this.  Same for later on in this file.

> -	if (!rtl8192_proc)
> +	dir = debugfs_create_dir(dev->name, NULL);
> +	if (IS_ERR(dir))
>  		return;

No need to check, just keep moving on.

>  
> -	dir = proc_mkdir_data(dev->name, 0, rtl8192_proc, dev);
> -	if (!dir)
> -		return;
> +	debugfs_create_file("stats-rx", 0444, dir, dev, &rtl8192_usb_stats_rx_fops);
> +	debugfs_create_file("stats-tx", 0444, dir, dev, &rtl8192_usb_stats_tx_fops);
> +	debugfs_create_file("stats-ap", 0444, dir, dev, &rtl8192_usb_stats_ap_fops);
> +	debugfs_create_file("registers", 0444, dir, dev, &rtl8192_usb_registers_fops);
>  
> -	proc_create_single("stats-rx", S_IFREG | 0444, dir,
> -			   proc_get_stats_rx);
> -	proc_create_single("stats-tx", S_IFREG | 0444, dir,
> -			   proc_get_stats_tx);
> -	proc_create_single("stats-ap", S_IFREG | 0444, dir,
> -			   proc_get_stats_ap);
> -	proc_create_single("registers", S_IFREG | 0444, dir,
> -			   proc_get_registers);
> +	priv->debugfs_dir = dir;

Again, no need to save this, just look it up when removing the
directory.

thanks,

greg k-h